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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1451b53e6f4fa30470710a49ba34c684f580ace1bc930377c0861e8c44b46020' 
  AND token = 'T5NAFv9MZ7SlfksRX85vUqoxotGdmXXbx5omQPBDQ6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}